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本文通过扫描电镜,俄歇谱仪和金相显微镜等手段,对掺杂钼和纯钼的粉,条乃至丝材,进行横、纵向观察,其结果表明,掺杂钼丝的再结晶温度比纯钼丝高,在1800℃以上仍保持着良好的机械性能。文章初步探讨了高温退火处理后,仍具有良好机械性能的机制。研究表明:掺杂钼丝经高温退火后,晶粒表面形成了规则排列的钾泡,阻碍了掺杂钼丝再结晶晶粒的横向长大。使晶粒沿丝轴方向和无钾泡处生长,形成锯齿形长晶,这种晶粒间相互啮合搭接,导致了高温退火后的掺杂钼丝具有良好的塑性和弯曲性能;并且钾泡行密度和长度愈大,则再结晶晶形比值L/W(L为再结晶晶粒长度,W为宽度)愈大,其机械性能也愈好。
In this paper, by scanning electron microscopy, Auger spectroscopy and metallurgical microscope and other means, the molybdenum and pure molybdenum powder, bar and even wire, the horizontal and vertical observations, the results show that the doped molybdenum wire recrystallization temperature ratio Pure molybdenum wire high, above 1800 ℃ still maintained a good mechanical properties. The paper preliminarily explores the mechanism that still has good mechanical properties after high temperature annealing treatment. The results show that after the high temperature annealing of doped molybdenum wire, the regular arrangement of potassium bubbles is formed on the grain surface, hindering the horizontal growth of the recrystallized grains of doped molybdenum wire. So that the grains grow along the axis of the wire and potassium-free growth to form zigzag long grains, which intermesh with each other lap, resulting in high temperature annealed doped molybdenum wire has good plasticity and bending properties; and potassium The greater the bubble density and length, the greater the recrystallized grain ratio L / W (L is the recrystallized grain length, W is the width) and the better the mechanical properties.